"For the last few months we’ve heard tidbits and hints about Microsoft’s upcoming Game Mode for Windows 10. The new mode, which is part of the Creators Update, is supposed to help some games run modestly faster — and as we suspected, it’s all about tuning system resources to dedicate more game-specific work to the CPU or GPU.
At GDC this week, Microsoft said Game Mode will dedicate a certain number of CPU cores to game rendering rather than allowing other background tasks to be scheduled concurrently on those chips, according to Ars Technica. An eight-core system, for example, might have six cores dedicated to gaming, with other tasks shunted to the “spare” cores.
On the GPU side, most of the GPU’s resources are already dedicated to gaming, especially if you’re playing in dedicated fullscreen mode as opposed to the borderless option that’s become popular, especially for UWP games. What Game Mode does in these cases is to dedicate even more GPU power to games and less for background tasks, while simultaneously keeping more of a game’s data in local RAM for easier loading. This should boost performance on lower-end hardware, though previous estimates of gain have been in the 2-5% range for most systems. Early tests of Game Mode didn’t show much benefit at all, though Microsoft could still be improving the feature. Fast Ring Windows 10 members often get early, beta patches of software."